Key-changeable lock.



B. KLOHS.

KEY GHANGEABLE LOCK. APPLIGATION FILED 001, 28, 1911.

Patented Jan. 19, 1915.

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BARTI-IOLOMEW KLOI-IS, or CANTON, OHIO.

KEY-CHANGEABLE LOCK.

Canton, inthe county of Stark and State of Ohio, have invented a new and useful Key- Changeable Lock, of which the following is a specification.

This invention relates to'improvements in locks provided with tumblers adapted to be set up in various combinations, it being possible to change the combination to respond to a new key without the necessity of taking the lock apart, the tumblers being set up to the new combination by the new key itself.

The invention is especially applicable to and frequently finds expression in the locks on safety deposit boxes in banks and the like Where a large number of such boxes are in use by various depositors and where it is frequently desirable to change the combination of a lock to respond to a new key when the box is rented by a new depositor. Where such locks are used on safety deposit boxes and the like it is frequently desirable to so construct the look as to require the use, not only of the depositors key, but also of a custodians pass key adapted to setup a pass tumbler in the lock not affected by the depositors key. In the present instance I have shown and shall describe a lock em- I bodying a pass tumbler adapted to respond to a pass key ofthe character mentioned.

The depositor then inserts his own key into the lock and unlocks it by actuating the depositors tumblers therewith, he being able to doso only after the pass tumbler hasthus been set up. WVhen the depositor again turns the key to lock the look not only the depositors tumblers but the pass tumbler is thrown down, and in order to again unlock the lock both the pass key and, the depositors key must be used. In some instances it will be understood that the pass key is used, by mistake, to set up the pass tumbler in the wrong lock, the mistake becoming apparent only when the depositors key fails to operate the tumblers, whereupon the mistake is discovered. In such instance it is desirable that the custodian be Specification of Letters Patent.

Patented Jan. 19, 1915.

Application filed October 28, 1311. Serial No. 657,381.

enabled to throw down the pass tumbler thus set up by mistake so that that particular lock cannot be opened by the person holding the depositors key therefore without being first identified as the proper owner thereof. Provision for this is made in the present invention, as will hereinafter appear.

The objects of the invention are to generally improve key-changeable locks, to simplify construction and reduce the number of parts, to provide a stronger, better and more accurate look less liable to get out of order and convenient and satisfactory in operation.

It is also an important object of the invention to do away with small parts, especially small moving parts, and to construct the tumblers along substantial lines adapted for proper mechanical operation.

These objects, together with other objects which will be apparent to those skilled in the art, may be attained by the construction illustrated in the accompanying drawings, although the invention may be embodied in other forms, the construction illustrated be ing chosen by way of example.

In the drawings Figure 1 is a front perspective View of a lock embodying my invention in locked position. Fig. 2 is a front interior view of the lock, the front plate being removed, showing the parts in locked position. Fig. 3 is a similar interior view :showing the parts in unlocked position.

Fig. 4 is a similar interior view of the lock, the depositors tumblers and fences being removed and disclosing the pass tumbler and fence in locked position. Fig. 5 is a similar interior view showing the parts in unlocked position. Fig. 6 is a similar interior view of the look, all of the tumblers and fences being removed and disclosing the bolt )late and rack plate in locked position. Fig. l is a similar interior view ofthe lock showing the parts in the unlocked, unset or neutral position ready to be set up to any desired combination. Fig. 8 is a perspective view of one of the depositors tumblers. Fig. 9 is a perspective view of one of the depositors fences. Fig. 10 is a perspective view of the pass tumbler. 11 is a perspective view of the stationary fence. Fig. 12 is aperspective view of the bolt plate and i tegral bolt. Fig. 13 is a perspective view 0% the rack plate with the rack-post attached. Fig. 14 is a perspective view of the bolt actuating key post. Fig. 15 is a seclock.

tional View through the rack plate releasing mechanism. Fig. 16 is a perspective view of the rack plate releasing button. Fig. l7'is a plan view'of the pass or setting-up key. F ig. 18 is a plan view of a dep'ositors key. Fig. 19 is a plan view of the unsetting key. Fig. '20 is a back perspective view of the Throughout the several views similar reference numerals indicate similar parts.

Special attention is now directed to Figs. 1 and 6. The casing of the lock is preferably made of metal and comprises the back plate 1, upper side 2, lower side 3, forward end i, and rear end 5, allof said parts being formed integrally. The forward end 4: is provided'with the bolt aperture 6 through which the bolt 7 of the lock extends. The front plate 8 is removably connected to the lock casing after the various parts have been arranged on the interior thereof, said front plate being connected to the casing by means of the screws 9 which enter screw threaded apertures 10 in bosses formed integrally with the casing. The front plate is provided with the key post collar 11 adapted to extend through the door on which the lock is arranged, the lock being intended to be fastened on the inner side of the door, as is common in lock construction of the sort herein concerned. To facilitate the fastening of the lock to the door the attaching-screw apertures 12 are arranged in the back plate 1 and corresponding notches 18 are arranged in the front plate 8 to permit attaching screws to pass completely through the lock and'be connected to the door upon which the lock is arranged.

- I Firmly connected at their bases to the back Y theplns as shown in Fig. 1.

plate 1 are the vertically spaced fence holding pins 1e and 15 which extend perpendicularly with reference to the back plate land are of the same height as the sides 2 and 3, the front plate 8 being provided with apertures to receive the upper ends of Attention is now especially directed to Figs. 6, 12 and 13. Immediately inside the back plate 1 are arranged the bolt plate 16 and the rack plate 17. The rack plate is clearlyillustrated in Figs. 6 and 13 and it will be noted that it comprises a main body portion provided with a horizontal.slot l8 adapted to accommodate the fence holding pin 15 as shown in Fig. 6, the slot 18 permitting the rack plate to slide horizontally within the casing. Also formed integrally with the main body of the rack plate is the lower horizontal sliding arm 19 adapted for sliding contact with the lower side 3 and having a sufficiently long horizontal bearing thereon to accurately guide the rack plate in its horizontal sliding movements. In addition to these features the rack plate is provided with an upper bolt plate retainvmain body of the rack plate arises perpendicularly the rack-post 2% having upper and lower horizontal parallelsides 25 and 26 respectively. The rack-post is also provided with the forwardly projecting rack teeth,

'27, said teeth being formed accurately and being vertically disposed with reference to the plane of the plate 17. Said teeth. are preferably formed of small cross-sectionto permit a large variety of delicate adjustments for various combinations as will 'hereinafter more fully appear. It is immaterial how the rack-post isconnected to the plate 17 but is is preferable to provide the plate 17 witha fixedly connected pin 28 and to provide the rack-post with a vertical aperture adapted to receive the pin, the post being prevented from rotation on said pin as willhereinafter appear.

The bolt plate 16, as has been hereinbefore stated, is arranged immediately inside of the back plate 1. The upper horizontal edge 29 of the bolt plate is adapted for sliding contact with the upper side 2 as illustrated in Fig. 6, while the lower horizontal edge 30 isv adapted for horizontal sliding engagement with the upper edge of the slid- .ing arm 19. At the rear end of the bolt plate the integral extended portion l hav-i ing the dependent lug32' is provided, the

lower horizontal edge of the portion 31 being adapted for sliding engagement with the upper edge of the lug '20 of the rack plate and the lug 32 being adapted to engage the lug 20 to limit the movement of the bolt plate away from the rack plate, as is clearly illustrated in Fig. 6. The rear vertical edge 83 on the bolt plate is adapted to engage the forward edge of the head 21 on the rack plate when the rack plateand bolt.

plate are moved. It will be thus understood that when the rack plate and bolt plate are arranged within the casing as shown in Fig. 6 the said plates will be limited in their sliding movement toward and away from each other and will assist in maintaining each other in proper position At the forward end of within the casing. V the boltplate the integral bolt 7 is provided which extends through the bolt aperture 6 in the forward end l of the casing, as hereinbefore described. At the upper portion of the plate 16 the shoulder ea is provided which shoulder is adapted to engage the lug 35 formed integrally with the casing to limit the'forward movement of the bolt plate as illustrated in. Fig. 6. In the body of the plate 16 the cam opening are in the positions illustrated in Fig; 6 the curved cam face of the cam-41 is in engagement with the forward cam edge 39, thus holding the plate 16 in its most forward position, the bolt 7 being extended through V the opening 6. If the key post 42 is rotated to throw the cam 41 upwardly and backwardly the curved cam face of the cam 41 will move along the edge 39 and past the shoulder 37, thence freely moving backwardly into positive engagement with the shoulder 38. A further backward movement of the cam 41 will carry the bolt plate 16 backwardly, to unlocked position as shown in Fig. 3. If the cam is then further turned backwardly the curved cam face thereof will, come into engagement with the rear cam edge so that when the key post 42 is in the positionillustrated in Fig. 7

the bolt will beheld in fully retracted posistem 45. At the rear end .of the back plate 1 said plate is provided with the stud receiving aperture 46, said plate being preferably provided with a boss aroundthe said aperture, as shown in the drawings, and being adapted to slidably receive the stud 43, the flange 44 being arranged immediately on the inside of the plate 1 as shown in Fig. 15. The front plate 8 on its inner side and opposite the aperture 46 is provided with a spring holding lug 47 which extends inwardly toward the stem 45. The coiled compression spring 48 extends from the flange 44 to the plate 8 and is arranged upon the stem 45 and lug 4.7, in order to keep it in proper operative position. The spring is adapted to normally hold the flange 44 against the inner side of the plate 1, as shown in full lines in Fig. 15, butthe button may be pushed inwardly against the tension of the spring 48 until the stem 45 comes into engagement with the lug 47, the stud 43 being slidably moved within the aperture 46, and the flange 44 being moved inwardly away from the inner side of the plate 1 into the position shown in dotted lines in Fig. 15. When the rack plate 17 is in its extreme forward position, being limplate, the edge 23 being in engagement with and proportions.

the peripheral edge of the flange 44. When the rack plate releasing button is pushed inwardly, however, as just above described, the flange 44 will be moved out of engagement with the rack plate, thus releasing the rack plate and permitting it to move backwardly, the portion thereof sliding under the flange 44, and between said flange and the back plate 1, the backward movement of the rack plate being limited by the slot 18 and the pin 15 hereinbefore described. This position is illustrated. in Fig. 7, where it will be noted that the rack post 24 has moved backwardly with the plate 17 to which it is connected, as hereinbefore described.

At this point attention should be called to the fact that so long as he flange 44 is in engagement with the plate 17, thus holding the plate 17 in its forward position, the

plate 16 cannot be moved backwardly farther than unlocked position shown in Figs. 3 and 5, the cam 41 on the key post 42 being turned backwardly but slightly farther than the vertical position, being prevented from turning farther backwardly by the engagement of the cam 41 with the rear shoulder 38 of the plate 16. When, however, the rack plate releasing button is pushed inwardly and the rack plate 17 thereby released, further backward rotation of the post 42 is possible, the cam 41 carrying backward both the plate 16 and the plate 17 into the position illustrated in Fig. 7, where it will be noted the cam 41 is key-way 49 and the rear key-way 50 only,

said key-ways constituting slots of the usual well known construction and being disposed diametrically opposite each other. i The post 42 is provided with the external head 51 adapted to rotatably fit within the collar 11, saidhead 51, post 42 and cam 41being provided with the key receiving slot 52. From an inspection of Fig. 1 it will be evident that a key may be inserted or withdrawn from the look only when the post 42 is turned with the cam 41 in its extreme forward or extreme backward position, it being impossible to remove the key from the look when the spindle is but partially rotated backwardly, as for instance in the position shown in Figs. 3 and 5.

In a lock of my invented construction all of the depositors tumblers are constructed in exactly the same way, all of said depositors tumblers being of the same shape, size" This is also true of all of the depositors fences used in the look. If a pass tumbler is used, however, said tumbler is of somewhat different construction from the depositors tumblers and a stationary fence, differing from the deposivtors fences, should also be used in connection with such pass tumbler.

As illustrated in the drawings, and especially in Fig. 8, each depositors tumbler comprises two members, a tumbler member proper and a spring member. The tumbler member proper is preferably stamped from sheet material in the form illustrated in Fig. 8, there .being a forward headportion 53 provided with a vertically disposed slot 54-, a rearwardly extending stem portion55 and a rear head portion 56 extending clownwardly from the stem and having a rearwardly open gate 57 and below said gate a vertically disposed slot 58 similar to the slot 54 and extending parallel therewith ..The spring 59 is fastened at its forward" end to the forward portion of the head 53' the vertically disposed slots 62 and 63 -re-- spectively. 1 35 Formed integrally with the bodyportion 61 are the rearwardly projecting rack teeth 6% adapted to mesh with the rack teeth 27 of the post 2-4 but said teeth 6% being preferably considerably greater in number than the number of teeth on said rack post so as to afford opportunity of considerable vertical adjustment as between each fence and the rack post 24. Also formed integrally with the body portion 61 isthe forwardly extending stub 65.

It will be understood that in the assembling of the lock one depositors fence should be used for each depositors tumbler and the stub 65 of each fence is adapted to enter the gate 57 in the corresponding depositors tumbler when said tumbler and fence are in appropriate relative vertical adjustment.

The pass tumbler is most fully illustrated in Fi 10 and com rises two members the pass tumbler member proper and the spring member. The pass tumbler member proper is preferably stamped from sheet material and comprises a forwardly projecting head 66 having an aperture 67 therein. said aperture being substantially divided into forward and rear portions by the depending tip 67 thus producing a heart shaped aperture. 1 The pass tumbler also has the main body 1 portion 68 having the pin-passing apertures 69 and '70 and also the rearwardly open gate 71. Inthe midst of the main bodyportion 68 is arranged the pass key aperture 72 concerning which itshould be noted that at the forward edge of said aperture is provided a key-entering notch 73 from which leads the curved upwardly and rearwardly inclined the forward end of the pass tumbler by the insertion of the forward end of said spring in the slot 78, in accordance with usual practice, and extends, when unstrained, upwardly and backwardly at an angle to the substantially horizontal upper edge of the turn bler.

As illustrated in Fig. 11, thestationary fence is preferably stamped from sheet material of the same thickness as that from which the pass tumbler is stamped, the stationary fence comprising the main, vertically disposed body portion'79 having arranged therein the vertically spaced apertures adapted to receive the fence holding pins 14 and 15 fixedly connectedto the plate 1 as hereinbefore described. Formed integrally with the main body of the stationary fence are thereaiuvardly projecting, spaced, rackpost holding portions 81 having oppositely disposed parallel edges adapted to slidably engage the upper and lower sides 25 and 26 .of the rack-post, so that while the rack post may move with the fence plate 17 back- 1 wardly and forwardly between the portions 81 said portions willprevent said post from turning and willguide its movements in a true and exact manner, Formed integrally with the body, portion 79 is the forwardly projecting stub 82.

It will be understood that if one of the pass tumblers such as described is used in the assembling of the lock, that one of the master fences such as described should also be used, the stub 82 being adapted to be slidably received into the gate 71 when the pass tumbler is in proper vertical adjustment.

Fixedly connected to the bolt plate 16 andextending vertically therefrom at the forward end thereof is the pass tumbler pin 83. Somewhat above and to the rear of the pin 83 the forward depositors tumbler pin 84: is arranged, while considerably to the rear and on the lower portion of the plate 16 is the rear deposito'rs tumbler pin 85. The'pins Si and85 are fixedly connected to the plate 16 and extend vertically therefrom substantially to the front plate 8.

In assembling the lock the bolt plate 16 and rack plate 17 are arranged immediately inside the back plate 1 as hereinbefore described and as clearly shown in Fig. 6. The depositors tumblers and fences and the pass tumbler and stationary fence may then said spring undertension to normally hold the rear end of the tumbler with its head portion 56 in the lowermost position. One of thedepositors fences is then arranged with the fence holding pins 14: and 15 extending through the slots 62 and 63 and the rack teeth Grearwardly disposed so as to mesh with the teeth 27 when the post 24 is moved into the forward position: This depositors tumbler and its corresponding depositors fence in the same plane will hereinafter he termed the depositors first set.

On top of the depositors first set is arran ed the ass set comprisin the b.

" the pin-passing apertures 69 and 70 freely receive the pins 84 and 85. It will be noted that the bolt 7 is provided with a rearwardly open reces's87 and the head 66 of the pass tumbler partially enters said recess when said pass tumbler is in its most forward position with relation to the'plate 16, the pin 83 in such case being located to the rear of the tip 67 as illustrated in Figs. 1 and 7. The spring 77 is arranged under the pin 86 to normally hold the rear end of the pass tumbler in its lowermost position and the stationary fence is arranged with the pins 14 and 15 extending through the apertures 80 thus preventing vertical and horizontal relative movement as between the stationary fence and the back plate 1. The

rack post 24 is mounted upon-the pin 28 between the portions 81 as hereinhefore described and is thus prevented from vertical movement but may be moved horizontally frontwardly and rearwardly with the plate 17 i Ontop of the pass set is arranged the depositors second set consisting of one depositors tumbler and one depositors fence of exactly the same construction as the tumbler and fence comprising the depositors first set, the slots 54: and 58 receiving the pins 8 1 and 85 and the slots 62 and 63 receiving the pins l l and 15 as hereinahoveset forth. -On top of this depositors second set may be similarly arranged any practical number of similar depositors sets in accordance with the degree of complexity desired.

Attention is now directed to the keys adapted to he used in the lock .and illustrated in Figs. 17, 18 and 19. It will he noted that said keys are of theflat variety and are provided with the integral shoulders 88 adapted by engagement with the inner sideof the plate 8, to prevent the keys from being-withdrawn from the lock except when said keys are turned to either of the key-ways 4:9 or 50, which key-ways slidahly receive said shoulder. The keys are also provided with the integral lug 89 adapted to enter the slot 52 of the cam 11 to give a firm hearing with said cam for the turning thereof by the key. Intermediate the shoulders 88 and the lugs 89 the depositors keys areprovided with various bittings such as illustrated in Fig. 8, while the pass or setting-up key is provided with the bitting shown in Fig. 17 and the unsetting key is provided with the hitting shown in Fig. 19. i It will he noted that the pass or settingup key is provided with the one tooth 90 only and the unsetting key is provided with the one tooth 90 only located in the same relative position as the tooth 90 but longer than said tooth 90. The teeth 90 and 90 are adapted to engage the pass tumbler only, as will hereinafter be more fully described. Each depositors key is fully cut away at the place, 91, corresponding to'the teeth 90 and 90 so that none of the depositors keys will affect the pass tumbler. Each depositors key is, however, provided with a plurality of other teeth 92 adapted to actuate the depositors tumblers, the teeth of the various depositors keys equaling in numher the depositors tumblers and all of said teeth varying in length by units equal to the pitch of the teeth of the fences and rack post 24.

Let it be supposed that the lock is assembled and in the position illustrated in Fig. 7, which is the unlocked, unset or neutral position. The teeth of the rack-post being out of engagement with the teeth of the fences and all of the depositors tumblers and fences being in the lowermost position. If it he desired to set up the depositors tumhlers to a combination corresponding to any desired depositors key, the depositors key in question is inserted into the look when the parts are as shown in Fig. 7 and the key turned in contra-clockwise direction. The various teeth of the depositors key will raise the individual depositors tumblers to various corresponding heights so that when the hitting of the key stands vertically the various depositors fences will have been raised to various heights by their respective tumblers, each depositors set assuming a distinct, individual position, depending upon the particular hitting of the key. The length of the different teeth of the hitting being varied by a unit of measure equal to the pitch of the teeth on the fences and rack post, the rack teeth 64 on the various fences will be arranged in alinement so as to mesh with the rack teeth 27 of the post 2 1-. By further contra-clockwise rotation of the key the cam 11 will bebrought into engagement with the forward shoulder 37 of the bolt them in the fixed relative vertical adjust-.

ment, and when the plate 17 has moved sufliciently forwardly, the spring 48 will move the rack plate releasing button outwardly, throwing the flange 1 1' into position behind the portion 22of the rack plate, thus retaining the rack plate in its forward position and preventing any undesired releasing of the rack post from the fences. In this locked position, as illustrated in Fig. 6, the rack plate will beheld in its forward position firmly engaging the Various fences by the rack teeth 27 and will be prevented from any backward movement not only by the flange 4-1, but also by the engagement of the lug 20 with the dependent lug 32, all parts, when in the position illustrated in Fig. 6 being thus most thoroughly and firmly locked. As the bolt plate 16 with the various tumblers thereto connected moves forwardly the gates of the various tumblers leave the stubs 65 and the tumblers thereupon drop into their lowermost positions, as shown in Fig. 2, with the rear edges of their head portions 56 engaging the ends of the stubs 65. At this time the key will have been revolved contra-clockwise one-half revolution, the bolt 7 will be in the extended, locked position and the key may be removed, the shoulder 88 passing out through the forwar i key-way 49- By the operation just described it will be noted that the various fences have been vertically adjusted with reference to each other to correspond to the bitting of the particular depositors key desired and that said fences will be retained in said positions, the combination being thus set up so as to respond to the particular depositors key and to no other. At the time when the various tumblers left their engagement with the stubs of the fences, the pass tumbler did the same sothat in the locked position the pass tumbler is in its lowermost position with its rear end edge bearing against the end of the stub of the pass fence. The depositors keys all being cut away at 91cannot affect the pass tumbler and therefore when it is desired to unlock the lock the pass or setting-up key illustrated in Fig. 17 must first be used. In using said pass or setting-up key it is inserted in the slot 52 when the parts are in the position shown in Figs. 2 or 4 and said key is thenturned in clockwise direction, the tooth 90' riding up the cam edge 74, engaging the lug 7 6, and lifting the pass tumbler upwardly and backwardly so that the stub 82 of the pass fence is entered partly into the gate 71 of the pass'tumbler, V

and the pass tumbler'isbodily moved back wardly so that the pin 88-is brought into that portion of the aperture 67 in front of the tip 67*. Inthis position the pass tumbler is said to be set up When the pass tumbler'has thus been set up the setting-up key may be'turned contra-clockwise .and removed from the'look when the cam 41 has .been turned into the frontward position shown in Figs. 2 or 4 without throwing down. the pass tumbler." The depositors key to which the lock combination has been set maythen be inserted and turned in clockwise direction, whereupon the lock will re spond to said key, the teeth of said key setting up the various depositors tumblers to appropriate height so that the stubs of the depositors fences may enter the gates of the depositors tumblers and'the bolt may be retracted to the extent shown in Fig. 3, the normally unlocked position of'the bolt. At this point the rear vertical edge 33 of the bolt plate 16 will come into engagement with the front edge ,of the head 21 of the rack plate 17 and normally prevent further retraction of the bolt and further rotation of the key. If, now, it be desired to throw the be in neutral position and the depositors' key may be removed.

It will be understood that at times the pass or setting-up key may, by accident be used upon the wrong lock and in order to accomplish the throwing down of the pass tumbler the unsetting key illustrated in Fig.

19 is employed. This key is provided with a slightly longer tooth QO than the tooth 90 of the pass or setting-up key. Should it be desired to throw down the pass tumbler after it has been setup as hereinbefore described by the pass or setting up key the key illustrated in Fig. 19 may be inserted when the cam 11 is in its most forward position and the key turned in clockwise direction, the tooth 90 riding up the cam edge 74. and drops into the upper notch 75, when by a contra-clockwise rotation the tooth 90, pressing frontwardly upon the side of the notch 75 will move the master tumbler forwardly so as to throw the pin 83 back of the tip 67 thus removing the stub 82 from the gate 71 of the pass tumbler and permitting the pass tumbler to drop into its lowermost position illustrated clearly in Fig. 4, whereupon it will 'be again necessary to use the setting up key previous to the appropriate depositors key in order to unlock the lock.

By reason of the fact that both the tumblers and fences move in true vertical lines at right-angles to the horizontal lines in which the bolt plate moves, extreme accuracy is attained, making it possible to form the stub of each fence so as to comparatively closely fit the gate of its corresponding tumbler. A pivoted tumbler in case of wear either on the part of the tumbler or key, greatly exaggerates the misadjustm'ent because of the fact that the gated end of such tumbler moves through a greater arc than the to the fact that by different location of the pass tumbler and pass fence with respect to the depositors sets, the number ofpossible combinations may be greatly multiplied. While in the lock herein shown and described the said pass tumbler and fence are located between the depositors first and second sets, it will be obvious that the same may be arranged between any other two of the depositors set-s. In this way different safety. deposit institutions located in the same city may be supplied with locks requiring different pass keys so'that it will be impossible for the keys belonging to the locks in one institution to be used on the locks on any other institution. This is all accomplished by the mere difference in arrangeni'ent of the sets in the lock and requires no difference in construction of parts. I

I claim: v

1. In a key changeable lock, in combination with varying keys, a lock casing, a bolt mounted therein and adapted for movement to assume an extended, locked position, a partially retracted, unlocked positionand a fully retracted, neutral position, a plurality of tumblers connected to and movable with said bolt, operable by said keys and adapted for individual movementwith relation to said bolt in lines transverseto the line of movement of said bolt, the individual movement of said tumblers being variable in accordance Wltll the variations in said keys, a plurality of fences connected tosaid casing, adapted for co-action with said line of tumblers and adapted for individual movement parallel to the individual movements of said tumblers, means for holding said fences in adjusted position and for simul taneously preventing complete retraction of said bolt, said means when in position to hold said tumblers in fixed position being unaffected by movement of said bolt from the locked to the unlocked position or vice versa, said means being adapted to be re leased independently of said keys to release said fences and permit complete retraction of said bolt.

2. In a key changeable look, a casing, a bolt and integral bolt plate mounted in said casing and adapted for forward and backward sliding movement and adapted to assuine an extended, locked position, a partially retracted unlocked position and a fully retracted neutral position, a rack plate mounted in saidcasing and adapted for forward andbackward sliding movement therein,

said rack plate provided with a rack, tumblers mounted upon said bolt plate and adapted to move forward and back ward therewith and also adapted for individual movement transverse to the movement of said bolt plate, fences mounted in said casing and adapted' for individual movement transverse to the line of movement of said rack plate, means preventing forward or backward movement of said fences within saidcasing, said tumblers adapted for coaction with said fences, said rack on said rack plate adapted to engage and hold said fences in fixed adjustment when said rack plate is in its forward position, but adapted to free said fences to permit individually indesaid rack plate, said rack plate adapted to normally prevent movement of said bolt plate to the neutral position, stop means adapted to normally hold said rack plate in its forward position but adapted to be actuated to permit backward movement of said rack plate, and said bolt plate adapted to move said rack plate to its rear position when said stop means is so actuated.

In testimony that I claim the above, I have hereunto subscribed my name in the presence of two witnesses.

BARTHOLOMEWV KLOHS.

\Vitnesses:

JOHN H. BisHoP,

VILLIAM H. MILLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

